How tall of grass?
Dwarf saggittaria grows quickly once it gets over transplant shock. In the first month-ish you'll lose a lot of leaves and won't see much growth, but then when it settles in, add a little fertilizer (I use Flourish) and it goes nuts. It sprout new plants on runners quite often, so in a few months you'll have a dense little jungle. The only thing is, even though it's "dwarf" sag., I have some stalks that are bent over in the tank well over a foot long. Trimming would prevent this, but I like it. The majority of it (80-90%) is ~6" tall.
It's a lot easier to grow than hair grass, and I never had luck with hair grass in sand. Not saying it can't be done, but I had some in sand and some more in flourite in the same tank, the sand clumps died after a few weeks.
~edit: i'm gunna post a pic of mine, one sec...
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I know it looks huge in this picture, but it's in a little 10g tank, so in a larger tank it will be less "jungle" and more "grass." And like I said, if I wanted I could trim it back every once in a while to keep it low.
